منابع مشابه
Heterochronic meiotic misexpression in an interspecific yeast hybrid.
Regulatory changes rapidly accumulate between species, and interspecific hybrids often misexpress genes. Hybrid misexpression, expression levels outside the range of both parental species, can result from cis- and trans-acting regulatory changes that interact abnormally in hybrids. Thus, misexpressed genes may contribute to hybrid sterility. However, in the context of a whole organism, misexpre...
متن کاملGenetic, embryonic and anatomical study of an interspecific cassava hybrid.
A molecular, anatomical and cytogenetic study of an interspecific hybrid between Manihot esculenta (cassava) and the wild species M. oligantha was carried out. Cytogenetics revealed relatively complete chromosome pairing and high viability of the pollen grains. Ovule structure examined by the clearing method showed polyembryony in 2.7% of the ovules. Doubling of the chromosome number resulted i...
متن کاملSpecies specificity of an enzyme determined by an erythrocyte nucleus in an interspecific hybrid cell.
In a previous study (Harris & Cook, 1969) it was shown that when a chick erythrocyte nucleus was introduced into the cytoplasm of a mutant mouse cell lacking the enzyme inosinic acid pyrophosphorylase (IMP: pyrophosphate phosphoribosyl transferase, E.C. 2.4.2.8.), synthesis of this enzyme was induced. However, it was not certain whether the enzyme induced in this way was mouse or chick enzyme, ...
متن کاملCytological characterization of an interspecific hybrid in Jatropha and its progeny reveals preferential uniparental chromosome transmission and interspecific translocation
Genetic variation in Jatropha curcas, a prospective biodiesel plant, is limited, and interspecific hybridization needed for its genetic improvement. Progeny from interspecific crosses between J. curcas and Jatropha integerrima can be used to improve agronomic characters and to increase oil content and yield. However, these hybrids have not been characterized cytologically. The present study was...
متن کاملInternal phloem in an interspecific hybrid of cassava, an indicator of breeding value for drought resistance.
We examined the stem anatomy of Manihot esculenta Crantz and its hybrid with M. oligantha Pax. Cross-sections were stained with safranin-alcian blue. Manihot esculenta and its hybrid were found to have the same vascular structure in bicollateral bundles with internal phloem, which has been associated with drought resistance in other plant groups. If this association is established for cassava, ...
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ژورنال
عنوان ژورنال: Hilgardia
سال: 1935
ISSN: 0073-2230
DOI: 10.3733/hilg.v09n05p265